User manual TRILITHIC THREE

[. . . ] Model Three Signal Level Meter Operation Manual Trilithic Company Profile Trilithic is a privately held manufacturer founded in 1986 as an engineering and assembly company that built and designed customer-directed products for telecommunications, military and industrial customers. From its modest beginnings as a two-man engineering team, Trilithic grew over the years and broadened its offerings of RF and microwave components by adding broadband solutions to its product line. This was accomplished with the acquisition of components manufacturer Cir-Q-Tel and instruments manufacturer Texscan. Today, Trilithic is an industry leader providing telecommunications solutions for major broadband, RF and microwave markets around the world. [. . . ] For example, even if you selected Channel 14 first, as you add Channels 4 and 6, these channels go to the top of the list. Use the and keys to scroll through the User Plan list one page (6 channels) at a time. To delete a Tilt/Favorite channel, scroll to the channel and press the removed from the list. Once you have selected from four to twelve favorite channels, press the information and return to the main Setup menu. key. The channel is key to save the Model Three Signal Level Meter - Operation Manual 39 Load Defaults Press the (ENTER) key to load the factory default settings for the Model Three and then display the Level screen. This will not change the User Channel plan. Prior Menu Press the (ENTER) key to return to the main Setup menu. Model Three Signal Level Meter - Operation Manual 40 Chapter 5 5. Basic Operation Once you have set up the Model Three's parameters, you are ready to operate the device. There are a number of tests you can perform with the Model Three: · · · · · · · · Single channel level tests Frequency mode Channel scans Limit tests Frequency scanning (spectrum) Hum measurement QAM measurement Tilt and favorite channel levels The Model Three displays readings down to -50 dBmV (+10 dBV). All signal levels that are below -40 dBmV (+20 dBV) are displayed with lighter shade digits in all measurement modes to indicate they are low signal levels. Fast Setup The Model Three features a Fast Setup function for each measurement mode. The specific setup menu for each mode can be accessed directly by pressing the key once while in the Measurement mode. This makes it unnecessary to go back to the main Setup menu and look for nested sub-menus. This allows the operator to quickly make changes in the settings and return to Measurement mode with no wasted time. Pressing the menu. key twice always displays the main Setup Model Three Signal Level Meter - Operation Manual 41 Single Channel Level Testing When set to the single channel level test, the Model Three displays bar graphs of the video and audio carriers as well as numeric readouts of the carrier amplitudes and V/A difference. The Model Three can also display a spectrum scan of the selected channel showing the amplitudes of the video and audio carriers and undesired signals that may be present, such as intermodulation. To access the Level screen, press the key. The Model Three displays the Level screen for the last channel it was on before being turned off. TV Channels When measuring a TV type channel with audio and video carriers (see Chapter 4: Setup, Channel Plan, Edit User Plan), the left column of the bar graph represents the video carrier while the right column displays the audio carrier. The V/A is displayed below the video and audio carriers. Channel label Channel Video carrier Audio carrier V/A User plan Channel type F1 To change the channel, use the channel number, and press the and F2 F3 key, enter the desired keys or press the (ENTER) key. (DOWN) key so The Level screen displays a scale that you can adjust by pressing the that the functions of the and keys become SCALE and REF. Press the (SCALE) key to vary the graduation of the scale according to a 1, 2, 5, and 10 dB per division scale. Model Three Signal Level Meter - Operation Manual 42 For example, to change the display graph from a 10 dB scale to a 5 dB scale, press the steps. key three times to cycle through the You may also change the reference level of the graph. Press the (REF) key and then press the and keys to increase or decrease the reference by one digit at a time. Press the (UP) key to return to the original Level screen so and keys become FREQ and that the functions of the MAX. The amplitude of the graph changes as you change the scale and reference so that it continues to indicate the correct level. You must press the and screen for the reference) again. (UP) key to return to the original Level keys to change channels (instead of The Model Two digital readout can be set to display a LIVE, MAX, or P-P signal level as an aid to troubleshooting. Press the below: · · · key to select the desired display mode as described LIVE is the normal operating mode whereby the digital display indicates the current value of the input signal. [. . . ] You can also press the The view of file records operates with Limit, Spectrum, and Scan records only. The View function does not operate with Level, Tilt, Hum, and QAM records. While viewing a data record, you can press the to the FILE CONTENT screen. Pressing the return you to the File Directory. key to return key again will Model Three Signal Level Meter - Operation Manual 73 Auto Test Records Auto test records are stored automatically (see Chapter 6: Advanced Operation, Auto Test). These records also appear in the File directory. [. . . ]